package com.itheima.mp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.baomidou.mybatisplus.extension.toolkit.Db;
import com.itheima.mp.domain.dto.PageDTO;
import com.itheima.mp.domain.po.Address;
import com.itheima.mp.domain.po.User;
import com.itheima.mp.domain.query.UserQuery;
import com.itheima.mp.domain.vo.AddressVO;
import com.itheima.mp.domain.vo.UserVO;
import com.itheima.mp.enums.UserStatus;
import com.itheima.mp.mapper.UserMapper;
import com.itheima.mp.service.IUserService;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

/**
 * @author maohd
 * @date 2024/4/28 16:59
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Override
    public void deductBalance(Long id, Integer money) {
        //1.查询用户
        User user = this.getById(id);
        //2.校验用户状态
        if (user == null || user.getStatus() == UserStatus.FROZEN) {
            throw new RuntimeException("用户状态异常！");
        }

        //3.校验余额是否充足
        if (user.getBalance() < money) {
            throw new RuntimeException("用户余额不足！");
        }

        //4.扣减余额 update user set balance = balance - ？
        //baseMapper.deductBalance(id, money);
        int remainBalance = user.getBalance() - money;
        lambdaUpdate().set(User::getBalance, remainBalance).set(remainBalance == 0, User::getStatus, UserStatus.FROZEN).eq(User::getId, id).eq(User::getBalance, user.getBalance()) //乐观锁
                .update();
    }

    @Override
    public List<User> queryUsers(String name, Integer status, Integer minBalance, Integer maxBalance) {
        return lambdaQuery().like(name != null, User::getUsername, name).eq(status != null, User::getStatus, status).gt(minBalance != null, User::getBalance, minBalance).lt(maxBalance != null, User::getBalance, maxBalance).list();
    }

    @Override
    public UserVO queryUserAndAddressById(Long id) {
        //1.查询用户
        User user = getById(id);
        if (user == null || user.getStatus() == UserStatus.FROZEN) {
            throw new RuntimeException("用户状态异常！");
        }
        //2.查询地址
        List<Address> addresses = Db.lambdaQuery(Address.class).eq(Address::getUserId, id).list();
        //3.封裝VO
        //3.1转user的PO为vo
        UserVO userVO = BeanUtil.copyProperties(user, UserVO.class);
        //3.2转地址vo
        if (CollUtil.isNotEmpty(addresses)) {
            userVO.setAddresses(BeanUtil.copyToList(addresses, AddressVO.class));
        }
        return userVO;
    }

    @Override
    public List<UserVO> queryUserAndAddressByIds(List<Long> ids) {
        //1.查询用户
        List<User> users = listByIds(ids);
        if (CollUtil.isEmpty(users)) {
            return Collections.emptyList();
        }
        //2.查询地址
        //2.1获取id用户集合
        List<Long> userIds = users.stream().map(User::getId).collect(Collectors.toList());
        //2.2根据用户id查询地址
        List<Address> addresses = Db.lambdaQuery(Address.class).in(Address::getUserId, userIds).list();
        //2.3转换地址vo
        List<AddressVO> addressVOList = BeanUtil.copyToList(addresses, AddressVO.class);
        //2.4用户地址集合分组处理 相同用户的放入一个集合（组）中
        Map<Long, List<AddressVO>> addressMap = new HashMap<>(0);
        if (CollUtil.isNotEmpty(addressVOList)) {
            addressMap = addressVOList.stream().collect(Collectors.groupingBy(AddressVO::getUserId));
        }

        //封装vo返回
        List<UserVO> list = new ArrayList<>(users.size());
        for (User user : users) {
            //3.1 转换user的po为vo
            UserVO vo = BeanUtil.copyProperties(user, UserVO.class);
            //3.2转换地址vo
            vo.setAddresses(addressMap.get(user.getId()));
            list.add(vo);
        }
        return list;
    }

    @Override
    public PageDTO<UserVO> queryUsersPage(UserQuery query) {
        //1.构建查询条件
        Page<User> page = query.toMpPageDefaultSortByUpdateTime();
        //2.分页查询
        Page<User> userPage = lambdaQuery().like(query.getName() != null, User::getUsername, query.getName()).eq(query.getStatus() != null, User::getStatus, query.getStatus()).ge(query.getMinBalance() != null, User::getBalance, query.getMinBalance()).le(query.getMaxBalance() != null, User::getBalance, query.getMaxBalance()).page(page);
        //3.封装vo结果
//        return PageDTO.of(userPage, UserVO.class);
        return PageDTO.of(userPage, user -> {
            //拷贝基础属性
            UserVO vo = BeanUtil.copyProperties(user, UserVO.class);
            //处理特殊逻辑
            vo.setUsername(vo.getUsername().substring(0, vo.getUsername().length() - 2) + "**");
            return vo;
        });
    }
}
